.TH JPEGEXIFORIENT "1" "February 2005" "jpegexiforient" "User Commands"
.SH NAME
jpegexiforient \- reads or writes the Exif Orientation Tag
.SH SYNOPSIS
.B jpegexiforient
[\fIswitches\fR] \fIjpegfile\fR
.SH DESCRIPTION
.
This is a utility program to get and set the Exif Orientation Tag.
It can be used together with jpegtran in scripts for automatic
orientation correction of digital camera pictures.
.PP
The Exif orientation value gives the orientation of the camera
relative to the scene when the image was captured.  The relation
of the '0th row' and '0th column' to visual position is shown as
below.
.IP
.nf
.ft CR
Value | 0th Row     | 0th Column
------+-------------+-----------
  1   | top         | left side
  2   | top         | right side
  3   | bottom      | right side
  4   | bottom      | left side
  5   | left side   | top
  6   | right side  | top
  7   | right side  | bottom
  8   | left side   | bottom
.fi
.PP
For convenience, here is what the letter F would look like if it were
tagged correctly and displayed by a program that ignores the orientation
tag:
.IP
.nf
.ft CB
  1        2       3      4     

888888  888888      88  88      
88          88      88  88      
8888      8888    8888  8888    
88          88      88  88
88          88  888888  888888

    5            6           7          8
                                               
8888888888  88                  88  8888888888
88  88      88  88          88  88      88  88
88          8888888888  8888888888          88
.fi
.PP
jpegexiforient output the Exif Orientation Tag in a JPEG Exif file.
With the options -1 .. -8, it can also be used to set the tag.
.
.SS "OPTIONS"
.TP
\fB\-\-help\fR
display this help and exit
.TP
\fB\-\-version\fR
output version information and exit
.TP
\fB\-n\fR
Do not output the trailing newline
.TP
\fB\-1\fR .. \fB\-8\fR
Set orientation value 1 .. 8
.SH "AUTHOR"
 Guido Vollbeding <guido@jpegclub.org>
.SH "SEE ALSO"
.BR jpegtran(1),
.BR exifautotran(1)
